Chrome: If you've been looking for ways to put Google's new +1 service to use, or just trying to get more into it, then this Chrome extension could be your ticket. The very unofficial "+1 Plus One" extension adds a button to your browser's toolbar that, when clicked, will show you the number of +1's that a site's received. It also allows you to add your own +1 on the fly, which is actually the more useful feature, since the only way to do it at the moment is through search results or buttons added to sites by their owners.